Method of flattening pipe



HOWARD W. SMITH, 0F ELLWOOD CITY, PENNSYLVANIA.

METHOD OF FLATTENING PIPE.

Application filed February To @ZZ 107mm t may 0012 cern Be it known thatl, HOWARD WV, SMITH, a citizen of the United States, and resident ofEllwood City, in the county of Lawrence and State of Pennsylvania, haveinvented a new and useful Improvement in Methods of Flattening Pipe; anddo hereby declare the following to be a full, clear, and exactdescription thereof.

My invention relates to methods of scrapping defective pipe.

In the manufacture of pipe, defective pieces are produced from time totime which have not been properly welded or may have some other defectso that the pipe has to be scrapped. The pipe in tubular form is verydifficult to handle as scrap either for remelting in the furnace or forshipment.

The object of my invention is to provide a simple and eflicient methodof scrapping this defective pipe, and to these ends my inventionconsists, generally stated, in introducing the pipe between rollswhereby rolling pressure is applied to opposite points in thecircumference of the pipe, and the pipe is crushed or reduced to aflattened form, or substantially so.

In the accompanying drawing, I have illustrated suitable apparatus forcarrying out my improved method in which Figures l and 2 show smoothfaced rolls for this purpose; and in Fig. 3 the method is carried out bycorrugated rolls.

The defective section of pipe 2 to be flattened is fed cold to the plainrolls and by pressure, either hydraulic or other power, the pipe, withthe end entering the rolls of the original shape and diameter, is forcedin between the space between the rolls, and the rolls will be rotated bythe forcing of the pipe in this manner through the same. T he front endof the pipe will be reduced, and having passed beyond the rolls theremaining portion of the pipe will be forced through so that the pipe isflattened and reduced by the pressure applied from opposite points onits circumference, the metal being free to spread laterally withoutrestraint.

My improved method can further be carried out by the use of corrugatedrolls, as shown in Fig. 3, and two sets of such rolls t and 5 may beemployed. These rolls are power-driven in any suitable manner, and aredriven to rotate in opposite direction as indicated by the arrows. Thepipe 7 to be Specification of Letters Patent.

Patented July i2, i921.

4, 1920. Serial No. 356,247.

flattened is advanced into the rst set of corrugated rolls 4, whereuponthe corrugations will act to pinch or break down the end of the pipe asindicated by dotted lines, and the pipe will be sent forward between thecorrugated rolls, each succeeding pair of corrugations acting to pinchand reduce the pipe so that the pipe is formed in a flattened wavycondition as indicated. ln case it is desired to further reduce thepipe, a second set of rolls 5 with smaller corrugations is employed andthe same action takes place, so that the pipe is further iiattened as itis advanced through this second set of rolls.

ln case it is not desired to have the pipe in the wavy condition due tothe corrugations, a plain set of rolls 8 may be employed for a finalpass to smooth out the waves formed by the corrugated rolls.

y my improved method, I provide a simple and etlicient way of reducinguniformly pipe of large diameter, for where the corrugated rolls areemployed the pipe will be pinched and reduced by each succeeding pair ofcorrugations, and fed through the rolls. Furthermore, the samecorrugated rolls may be employed for pipes of many different diameters,it only being necessary to have pipe of such diameter that it will enterbetween the corrugations and be pinched or reduced by the succeedingpair.

By my invention, I provide a method which does away with the old methodheretofore generally employed, of introducing the pipe between the diesof a press or between hammer dies and feeding the pipe forward So as tobring its dierent portions of its entire length under the action of thepress or hammer, and such an operation is very slow and tedious andrequires great power.

What I claim is:

l. The method of scrapping defective pipe, consisting in forcing thepipe longitudinally between rolls with the end entering the rolls beingof its original shape and diameter, and allowing the metal to spreadlaterallv without restraint.

2. The method of scrapping defective pipe consisting in forcing the pipelongitudinally through corrugated rolls, the end entering the rollsbeing of its original shape and diameter, pinching the end of the pipeand drawing it in by one pair of corrugations, and subsequently pinchingand drawing in the pipe by the succeeding corrugations in succession,and allowing the metal to spread laterally ywithout restraint 3. Themethod of flattening pipe comprising forcing the'pipe longitudinallybetween corrugated rolls and straightening the flattened pipe by passingit between -a'set of Y plain rolls.

l. The method of scrapping vdefective pipeconsisting in forcingthe pipelongitudinallybetween corrugated Tolls, forcing the flattened pipebetweencoirugated'rolls having smaller coi'iugations, and straightening,the flattened pipebypassing it between a Set HOWARD W.. SMITI-LWitnesses Y e. A. PUGH; W'. J. MOORE.

